Universität zu Köln

D'Angelo, Olfa ORCID: 0000-0002-7218-4596, Kuthe, Felix, van Nieuwland, Kasper, Janssen, Clint Ederveen, Voigtmann, Thomas ORCID: 0000-0002-1261-9295 and Jalaal, Maziyar ORCID: 0000-0002-5654-8505 (2022). Spreading of droplets under various gravitational accelerations. Rev. Sci. Instrum., 93 (11). MELVILLE: AIP Publishing. ISSN 1089-7623

Full text not available from this repository.

Abstract

We describe a setup to perform systematic studies on the spreading of droplets of complex fluids under microgravity conditions. Tweaking the gravitational acceleration under which droplets are deposited provides access to different regimes of the spreading dynamics, as quantified through the Bond number. In particular, microgravity allows us to form large droplets while remaining in the regime where surface tension effects and internal driving stresses are predominant over hydrostatic forces. The vip-drop(2) (visco-plastic droplets on the drop tower) experimental module provides a versatile platform to study a wide range of complex fluids through the deposition of axisymmetric droplets. The module offers the possibility to deposit droplets on a precursor layer, which can be composed of the same or a different fluid. Furthermore, it allows us to deposit four droplets simultaneously while conducting shadowgraphy on all of them and observing either the flow field (through particle image velocimetry) or the stress distribution inside the droplet in the case of stress birefringent fluids. It was developed for a drop tower catapult system, is designed to withstand a vertical acceleration of up to 30 times the Earth's gravitational acceleration in the downward direction, and is capable of operating remotely under microgravity conditions. We provide a detailed description of the module and an exemplary data analysis for droplets spreading on-ground and in microgravity. (C) 2022 Author(s).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code D'Angelo, Olfa UNSPECIFIED orcid.org/0000-0002-7218-4596 UNSPECIFIED Kuthe, Felix UNSPECIFIED UNSPECIFIED UNSPECIFIED van Nieuwland, Kasper UNSPECIFIED UNSPECIFIED UNSPECIFIED Janssen, Clint Ederveen UNSPECIFIED UNSPECIFIED UNSPECIFIED Voigtmann, Thomas UNSPECIFIED orcid.org/0000-0002-1261-9295 UNSPECIFIED Jalaal, Maziyar UNSPECIFIED orcid.org/0000-0002-5654-8505 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-684039
DOI:	10.1063/5.0105624
Journal or Publication Title:	Rev. Sci. Instrum.
Volume:	93
Number:	11
Date:	2022
Publisher:	AIP Publishing
Place of Publication:	MELVILLE
ISSN:	1089-7623
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language YIELD-STRESS; SURFACE-TENSION; BEHAVIOR; COMPLEX; FLUIDS Multiple languages Instruments & Instrumentation; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68403